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Lithium metal battery negative electrode and preparation method and application thereof

A lithium metal battery, lithium metal technology, used in electrode manufacturing, battery electrodes, lithium batteries, etc., can solve problems such as lithium metal and electrolyte consumption, SEI instability, electron conduction rate and electron density, and uniformity. , to achieve stable electrochemical and chemical stability, uniform lithium deposition and stripping, and improve electrochemical performance.

Active Publication Date: 2019-05-28
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium metal still has its own problems as a negative electrode material, including the following points: first, the solid electrolyte interfacial film (SEI) on the surface of lithium metal is uneven, causing uneven deposition and stripping of lithium metal; There is a large amount of volume expansion during the stripping process, which further leads to the instability of SEI; the third is the high reactivity of lithium metal and electrolyte, which leads to the continuous consumption of lithium metal and electrolyte
The above problems make the lithium metal negative electrode show low Coulombic efficiency and poor cycle performance during the charge and discharge process, which will eventually cause safety problems such as lithium dendrite growth, battery short circuit and thermal runaway.
[0004] The problem of traditional secondary lithium-ion battery materials leads to a huge difference in the electron conduction rate, electron density, and uniformity of the active material close to the surface of the current collector and the active material on the electrode surface, and it is impossible to form a stable interface between the lithium metal and the electrolyte. SEI, which severely limits the development of lithium metal anodes

Method used

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  • Lithium metal battery negative electrode and preparation method and application thereof
  • Lithium metal battery negative electrode and preparation method and application thereof
  • Lithium metal battery negative electrode and preparation method and application thereof

Examples

Experimental program
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Embodiment 1

[0030] Please check figure 1 , 2 And 3, this embodiment uses foamed nickel as the current collector; first, the pyrrole monomer solution is added dropwise to the aqueous solution containing ammonium thiosulfate, and then the foamed nickel is placed in the solution. After standing still at room temperature for 6 h, it was taken out and dried as a working electrode, and a 2032 button cell was assembled in a glove box filled with argon. Among them, the metal lithium sheet is used as the counter electrode and the reference electrode, and the electrolyte is 1M lithium bistrifluoromethanesulfonylimide and 1,2-dimethoxyethane and 1,3-dimethoxyethane with a volume ratio of 1:1. Dioxolane. Subsequently, lithiation was carried out at a current density of 0.1mA / cm 2 Under constant current discharge for 1.4h, followed by lithium deposition, the negative electrode for lithium metal was prepared. Lithium deposition conditions: at a current density of 1mA / cm 2 Under constant current dis...

Embodiment 2

[0037]The difference between this example and Example 1 is that: firstly, the aniline monomer solution is added dropwise into the mixed aqueous solution containing hydrochloric acid and ammonium thiosulfate, and then nickel foam is placed in the solution. After standing still at room temperature for 6 h, it was taken out and dried as a working electrode, and a 2032 button cell was assembled in a glove box filled with argon. Among them, the metal lithium sheet is used as the counter electrode and the reference electrode, and the electrolyte is 1M lithium bistrifluoromethanesulfonylimide and 1,2-dimethoxyethane and 1,3-dimethoxyethane with a volume ratio of 1:1. Dioxolane. Subsequently, lithiation was carried out at a current density of 0.1mA / cm 2 Under constant current discharge for 1.4h, followed by lithium deposition, the negative electrode for lithium metal was prepared. Lithium deposition conditions: at a current density of 1mA / cm 2 Under constant current discharge, the ...

Embodiment 3

[0043] The difference between this example and Example 1 is: firstly, the 3,4-ethylenedioxythiophene monomer solution is added dropwise to the mixed aqueous solution containing camphorsulfonic acid and ammonium thiosulfate, and then the nickel foam is placed in the solution middle. After standing still at room temperature for 6 h, it was taken out and dried as a working electrode, and a 2032 button cell was assembled in a glove box filled with argon. Among them, the metal lithium sheet is used as the counter electrode and the reference electrode, and the electrolyte is 1M lithium bistrifluoromethanesulfonylimide and 1,2-dimethoxyethane and 1,3-dimethoxyethane with a volume ratio of 1:1. Dioxolane. Subsequently, lithiation was carried out at a current density of 0.1mA / cm 2 Under constant current discharge for 1.4h, followed by lithium deposition, the negative electrode for lithium metal was prepared. Lithium deposition conditions: at a current density of 1mA / cm 2 Under cons...

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Abstract

The invention discloses a lithium metal battery negative electrode as well as a preparation method and application thereof. The negative electrode can provide stable and effective protection for lithium metal by generating a high-molecular polymer layer on a conductive current collector and then performing lithiation to generate a functional layer with a lithium ion conduction effect. In the preparation process, inert gas is not needed for protecting the lithium metal, the method can be carried out in the atmosphere, the production cost is greatly reduced, and the practical process of the lithium metal is promoted. The prepared negative electrode for the lithium metal battery can provide uniform lithium deposition and stripping and effectively inhibit generation of lithium dendrites, so that the coulombic efficiency, the cycling stability and the safety of the battery are obviously improved.

Description

technical field [0001] The invention relates to a negative electrode for a lithium metal battery, a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles, smart grids, and portable electronic devices due to their advantages such as high specific energy, small self-discharge, and no memory effect. However, with the development of energy technology, higher requirements are placed on the energy density and power density of lithium-ion batteries. Traditional lithium-ion batteries use graphite as the anode material, but the low theoretical specific capacity (372mAh / g) of graphite anode severely limits its further development. Therefore, it is particularly important to develop anode materials with higher specific capacity, such as silicon-based anodes and lithium metal anodes. [0003] Lithium metal is considered to be an ideal anode material because of its high theoretical specific capacity (3860mAh / ...

Claims

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Application Information

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IPC IPC(8): H01M4/1395H01M4/04H01M4/134H01M10/052H01M10/42
CPCY02E60/10
Inventor 赵金保彭月盈温志鹏张鹏
Owner XIAMEN UNIV